Thermostat is a device for maintaining a static (constant) temperature, as its name implies. There are thermostats of different designs in many devices and mechanisms, from water heaters to refrigerators. There is also a thermostat in a car's internal combustion engine (liquid-cooled, of course). In a car, the thermostat regulates the temperature of the coolant (antifreeze): it accelerates the warm-up of a cold engine and provides heat removal from the hot one. Therefore, the engine works more efficiently and more comfortably for the driver, especially in winter - without a thermostat, the stove would usually blew cold air.

1. S-CLASS (W221)
2. S-CLASS Saloon (W221)
3. GL-CLASS (X164)
4. GL-CLASS SUV (X164)
5. SL (R230)
6. SPRINTER 3-t Bus (906)
7. SPRINTER 3-t Van (906)
8. SPRINTER 3-t Platform/Chassis (906)
9. SPRINTER 3,5-t Bus (906)
10. SPRINTER 3,5-t Van (906)
11. SPRINTER 3,5-t Platform/Chassis (906)
12. S-CLASS Coupe (C216)
13. E-CLASS T-Model (S211)
14. E-CLASS (W211)
15. E-CLASS Saloon (W211)
16. CLK (C209)
17. CLK Convertible (A209)
18. R-CLASS (W251, V251)
19. M-CLASS (W164)
20. M-CLASS SUV (W164)
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The principle of the thermostat work

The classic MAHLE ORIGINAL brand Thermostat, coolant is a movable valve that moves due to a change in the external environment - heating or cooling of antifreeze. The thermostat is made of a thermoelement filled with a substance resembling wax in structure - ceresin, with the addition of copper powder, graphite or aluminum for better thermal conductivity. At a certain temperature of the antifreeze, ceresin expands, opening the thermostat valve. When the motor cools down, ceresin contracts and the thermostat closes again.